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In many homes the demarcation point is inside the home at the "electrical panel", where the one wire that comes into the home is then split in various directions for TV, broadband, etc. This depends on the home since sometimes some splitters can be in the "grey box" outside. The grey box belongs to the cable company and they can "cut" there, but, obviously cannot inside the home at the electrical panel.

 

[57]

You may wish to call Shaw advising them of what you plan to do and perhaps ask them to remove their box (which they may not do hoping you or the next owner return to Shaw)

The instances of cut cables, etc (at the grey box) are usually when there's something more to the story than simply cancellation of service.